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Proceedings Paper

Improved alignment technique enabling cross-coupled operation of a 3D LDA for small-scale flow surveys
Author(s): J. Rickards; C. Swales; C. J. Brake; R. V. Barrett
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Paper Abstract

The paper describes a new alignment technique for three-dimensional Laser Doppler Anemometers (LDAs), which has enabled accurate velocity measurements to be obtained within very small flow regions. This technique uses a quantitative, rather than the more usual qualitative approach, to give greater consistency and reliability, resulting in greatly improved alignment of the laser beams. This enables much higher data rates and validity to be achieved, even in the critical cross-coupled mode, which in turn allows a significantly smaller measurement volume, thereby increasing the spatial resolution of the system. Examples are given which illustrate the type of small scale velocity surveys now possible as a result of this technique. These show 3D velocity surveys taken within the wake behind a 0.8 mm diameter surface particle in a boundary layer, and examples of three-component boundary layer velocity profiles in the order of 0.2 mm thick, recorded on a horizontally mounted cylinder rotating about a central vertical axis.

Paper Details

Date Published: 6 August 1993
PDF: 8 pages
Proc. SPIE 2052, Fifth International Conference on Laser Anemometry: Advances and Applications, (6 August 1993); doi: 10.1117/12.150570
Show Author Affiliations
J. Rickards, Univ. of Bristol (United Kingdom)
C. Swales, Univ. of Bristol (United Kingdom)
C. J. Brake, Univ. of Bristol (United Kingdom)
R. V. Barrett, Univ. of Bristol (United Kingdom)

Published in SPIE Proceedings Vol. 2052:
Fifth International Conference on Laser Anemometry: Advances and Applications
J. M. Bessem; R. Booij; H. W. H. E. Godefroy; P. J. de Groot; K. Krishna Prasad; F. F. M. de Mul; E. J. Nijhof, Editor(s)

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